[BlueOnyx:01292] Updated CMU available (fix for 0 byte mbox after import)

[Michael Stauber]

Hi all,

I just released a new CMU RPM to the BlueOnyx YUM repository:

5106R-cmu-2.66-0BQ30.centos5.noarch.rpm

You can grab it with "yum update".

It fixes the problem where - after an import - users randomly had lost all 
emails from their mailbox.

This affected all ... 
	
	BlueOnyx to BlueOnyx 
	BlueQuartz to BlueOnyx
	RaQ550 to BlueOnyx
	BlueQuartz to BlueQuartz
	RaQ550 to BlueQuartz

... migrations.

In fact that problem already existed in the original BlueQuartz CMU (and still 
does) - except in some really ancient versions of it.

On BlueOnyx and BlueQuartz the mailbox of a user resides in ~username/mbox - 
which typically translates to something obscure like this:

	/home/.sites/28/site1/.users/40/testuser/mbox

When you run cmuExport, then the mailbox (mbox) is packed up into private-
username.tar.gz - alongside with other files from that users home directory. 
Additionally CMU will include a copy of "mbox" as "cmu-mailspool".

And exactly there CMU did wrong in the past:

It didn't take our "/home/.sites/28/site1/.users/40/testuser/mbox" and stored 
it as "cmu-mailspool" into the export. No, it used "/var/spool/mail/username" 
instead. Which doesn't exist or which is empty on BlueQuartz and/or BlueOnyx.

Upon restore cmuImport *always* used "cmu-mailspool" from private-
username.tar.gz and copied it to "~usename/mbox". Once that's done, it'll 
delete "cmu-mailspool", as it's no longer needed. 

To fix this issues extra checks were added that make sure that CMU copies the 
right mailbox file to "cmu-mailspool". Additional checks also make sure that 
CMU will not copy a 0 byte sizes "cmu-mailspool" over an already existing 
"mbox" file upon cmuImport.

This works fine even if you import with CMU and use sets of data that were 
exported with the broken previous versions of CMU from either BlueQuartz or 
BlueOnyx. Because if your "bad" CMU created an empty "cmu-mailspool" in the 
export, then it will just restore the good "mbox" file that it finds in that 
export, which contains all your emails.

Further fixes to CMU include better cross-platform support for Rickard Osser's 
BlueApp.

Code changes:
http://devel.blueonyx.it/trac/changeset?old_path=%2F&old=266&new_path=%2F&new=268

-- 
With best regards

Michael Stauber